Master's Dissertation
DOI
https://doi.org/10.11606/D.18.2019.tde-02102019-101252
Document
Author
Full name
Denis Bertazzo Watashi
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2019
Supervisor
Committee
Hachich, Waldemar Coelho (President)
Kanji, Milton Assis
Portelinha, Fernando Henrique Martins
Title in Portuguese
Estudo paramétrico de escavações subterrâneas
Keywords in Portuguese
Abaqus®
planejamento fatorial
simulação numérica
túneis
Abstract in Portuguese
Title in English
Parametric study of underground excavations
Keywords in English
Abaqus®
factorial planning
numerical simulation
tunnels
Abstract in English
One of the major problems in Geotechnical Engineering is the determination of soil parameters. This fact is due to the nature of the soil formation, which shows a high degree of uncertainty in the values of its parameters. Therefore, it is important to establish values for the soil parameters, which produce calculated values close to those measured in the field. In the case of tunnel construction, this procedure is fundamental, because predicting the behavior of an underground excavation advance, usually involves complex three-dimensional models. With some simplifications being adopted, the objective of this study was to find simpler analytical models that reasonably predict the behavior of a tunnel excavation.With a simple model, it is possible to evaluate the influence of the parameters on the behavior of the excavation. It is also possible to carry out retro-analyzes, so that the degree of uncertainty of these parameters decreases. In this work, the main mathematical fundamentals concerning the subject are presented. Also, a procedure for applying factorial planning of experiments in numerical models was developed. The objective was to ensure that the developed procedure could be applied to problems of practical engineering interest. The procedure developed herein was applied in two cases. In the first one, a tunnel model was analyzed, assuming a linear elastic behavior for the materials. In the second case, an elastoplastic behavior was assumed for the materials and the model was calibrated with results of centrifugal models. The factorial planning of experiments was successfully applied to obtain the sensitivity of the soil parameters, in respect to the displacements of the tunnel section crown. In addition, this technique facilitated the obtaining of simplified models that make it possible to predict the displacements of the excavation crown for any combination of soil parameters, provided that the variation limits initially observed are respected.